Apparatus for roasting coffee.



WITNESSES No. 673,645. Patented May 7, I901. F. KUBHELMEISTER.

APPARATUS FOR ROAS-TING COFFEE.

(Application filed. Oct 11, 1900.;

(No Model.)

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UNITED STATES FRIEDRICH KUCHELMEISTER,

OF BRTIX, AUSTRIA-HUNGARY.

APPARATUS FOR ROASTING COFFEE.

SPECIFICATION forming part of Letters Patent No. 673,645, dated May 7, 1901, Application filed October 11, 1900. Serial No. 32,729. (No model.)

To all whom it may concern.-

Be it known that I, FRIEDRICH KUOHEL- MEISTER, merchant, a citizen of the Empire of Austria-Hungary, residing at Briix, Bohemia, Austria-Hungary, have invented a'certain newand useful Improvement in Apparatus for Roastin g Coffee, Malt, and the Like, of which the following is a specification.

The object of the present invention is an apparatus for roasting coffee, malt, figs, grains, and the like which permits perfectly uniform roasting of such materials, owing to the circumstance that adhesion and burning of the roasting material in any part of the surface of the roasting-drum are prevented, and in which no emission and diffusion of the gases or vapors disengaged in the roasting process into the room where the operation takes place can occur.

Referring now to the drawings which form a part of this specification, Figure 1 is a front elevation of the apparatus. Fig. 2 is a crosssection, and Fig. 3 is a longitudinal section through the same.

The most important part of the apparatus that is to say, the drumconsists of an inner drum a, of wire-gauze, and an enter one, I), placed at a certain distance (about ten millimeters) from the former and which is made of solid iron plate. The inner drum or lining a, is mounted in the center and at the ends with angle or fiat irons c and stayed by obliquely-placed spokes d, of rod-iron. The end faces of the drum are conically shaped. The drum is keyed to a hollow spindle or shaft 6, which is borne so that it can freely revolve in a frame h. The frame or crosspiece it is guided at each end in ways in the side walls of the apparatus and is so located that when it is drawn out the drums at and b are drawn out with it.

The part of the tubular shaft or spindle situated inside the drum is provided with slots f. The inner cavity of the shaft or spindle is divided in the center of the drum by a partition g. The rear end of the shaft or spindle e projects into a vapor-discharge pipe k, which communicates with the chimney either direct or through the fine 2'.

The heating-chamber of the apparatus is closed at front by means of sliding doors m m, which are mounted so that they slide on upright parallel guide-rails 1". At the upper ends of the guide-rails are pulleys 19, over which are conducted two cords or chains 0 0, that are connected at their opposite ends with the doors m m, so that the doors may counterbalance each other. When the upper door is pulled down the lower door is pulled up, so that the doors meet and close the chamber; but when the lower door is pulled down the upper door is pulled up, so as to open the chamber for access to the roasting-drum. On opening the sliding doors m the drum, together with the frame h, in which its shaft or spindle is borne, can be removed, so that it can be conveniently filled or emptied. To this end a little door 91 is arranged in the cylindrical surface of the drum, likewise double-walled and made to close hermetically. The outer wall b of the drum shuts ofi the inner space perfectly hermetically. The shaft 6 is made sufficiently long to reach still into the vapor-discharge pipe 10 even when the drum is drawn forward. The apparatus according to the present invention affords the advantage that the flames playing upon the outer drum b impart a uniform heat to the inner drum (1 through the intervening interstice, whereby burning and adhesion of the beans and the like are entirely prevented.

Fresh air continually enters the drum through the front part of the hollow shaft 6 and the draft holes or slots f, arranged in it in front of the partition g, while the gases and the vapors developed in the roasting process escape through the slots f, arranged behind thepartition,intothe chimney. Consequently in using this apparatus the workroom or kitchen is not, as hitherto, filled with the gases and vapors developed in the roasting operation, but remains quite free from them.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a roasting apparatus, the combination of a furnace, a double-walled rotary drum, consisting of an inner wall of wire-gauze, and an outer wall, placed at a suitable distance from the inner wall, shutting off the interior of the drum from the interior of the furnace, and a tubular shaft for said drum, suitably guided in the furnace and provided with means of rotation, said tubular shaft being provided with openings and having a partition, on both sides of which said openings are located, substantially as set forth.

2. In a roasting apparatus, the combination of a furnace, a double-walled rotary roastingdrum in the furnace, a tubular shaft to which the drum is fixed, a sliding frame in which the shaft bears, said shaft being provided within the drum with openings or slots, and a partition dividing the hollow shaft into two parts, whereby, during the roasting process, fresh air may enter the drum through the openings in front of the partition, while the gases and vapors generated may escape through the openings behind the partition and thence into the outer air, substantially as set forth.

3. In a roasting apparatus, the combination of a rotary drum provided with a tubular shaft, said shaft having openings, means for heating the drum, and avapor-discharge pipe into which the rear end of the tubular shaft is loosely guided, whereby the gases and vapors are led through the openings, shaft and discharge-pipe into the outer air, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

FRIEDRICH KUCHELMEISTER.

Witnesses:

ALVESTO S. HOGUE, ALBERT BENCKE. 

